Fix Issue entity undefined method `namespace' for nil:NilClass

Eugenia Grieffrequested to merge
480427-issue-links-api-fails-when-an-issue-is-linked-to-a-work-item-epic into master

What does this MR do and why?

Related to #480427 (closed)

Fix error undefined method namespace for nil:NilClass in EE::API::Entities::Issue.

If an issue belongs to a group, its project can be nil, which results in 500 errors for certain REST issue endpoints.

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Edited by Eugenia Grieff

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